Mandrill MX: Invalid

I’m experimenting with Mandrill and every domain I’ve added, including some I added months ago, were showing “MX: Invalid”. The MX records were in place, for one domain, they were in place before I added the domain to Mandrill.

When their support helpdesk got back to me, the solution was simple. I had to click the “Test” button next to each domain. What a PITA. I waited a couple of days to click a damn button that I found no reference to in their documentation. Bah humbug.

I am using Mandrill successfully for other sites. I have just added your WP Mail SMTP plugin to a Wp blog and activated a new API key for the blog in Mandrill. I did everything in the WP admin but when I sent a test email to an address, your plugin’s debug shows the following errors:

The error message suggests there was an authentication failure. I’d suggest resetting / verifying both the username and the password. Failing that, it might be an issue around the type of authentication methods that are allowed. Is the SSL option also set to the same as your other sites which do work? Are those sites on the same server (same PHP config, firewall, etc)?